Genetic differences may affect the results of tests given to athletes to see if they have been taking performance-enhancing drugs.

By Susan Gaidos, 00:00 AM April 9, 2008

Drug testing in sports is a serious matter. Athletes train hard to build muscle and body strength. Some may even resort to cheating. They can do this by abusing drugs called steroids to build extra muscle. This practice is not only unhealthy, but it also gives an athlete an unfair advantage. That's why most professional sports test for it.

Now, scientists say that to keep the game fair, teams may want to test athletes' genes, as well. Depending on what genes they have, some athletes can bea...